<template>
  <div>
    <!--面包屑导航区域 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图区域 -->
    <el-card>
      <!--警告区域 -->
      <el-alert
        :closable="false"
        show-icon
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning">
      </el-alert>
      <!--选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <el-cascader
            expand-trigger="hover"
            v-model="selectedCateKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"></el-cascader>
        </el-col>
      </el-row>
      <!--Tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtndisabled" @click="setDialogVisible=true">添加参数
          </el-button>
          <!--动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!--循环渲染Tag标签 -->
                <el-tag @close="handleClose(i,scope.row)" closable v-for="(item,i) in scope.row.attr_vals" :key="i">
                  {{item}}
                </el-tag>
                <!--输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!--添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit"
                           @click="showEditDialog(scope.row.attr_id)">
                  修改
                </el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="deleteParams(scope.row.attr_id)">删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" :disabled="isBtndisabled" @click="setDialogVisible=true">添加属性
          </el-button>
          <!--静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!--循环渲染Tag标签 -->
                <el-tag @close="handleClose(i,scope.row)" closable v-for="(item,i) in scope.row.attr_vals" :key="i">
                  {{item}}
                </el-tag>
                <!--输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!--添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit"
                           @click="showEditDialog(scope.row.attr_id)">
                  修改
                </el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="deleteParams(scope.row.attr_id)">删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!--添加参数对话框区域 -->
    <el-dialog
      @close="addDialogClosed"
      :title="'添加'+titleText"
      :visible.sync="setDialogVisible"
      width="50%">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="setDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
    </el-dialog>
    <!--修改的对话框区域 -->
    <el-dialog
      @close="editDialogClosed"
      :title="'修改'+titleText"
      :visible.sync="editDialogVisible"
      width="50%">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  created () {
    this.getCateList()
  },
  data: function () {
    return {
      // 商品列表数据
      cateList: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的标签页的名称
      activeName: 'many',
      // 动态参数数据
      manyTableData: [],
      // 静态属性数据
      onlyTableData: [],
      // 控制添加参数对话框的显示与隐藏
      setDialogVisible: false,
      // 添加动态参数/静态属性的表单数据
      addForm: {
        attr_name: ''
      },
      // 添加参数/静态属性的表单校验规则
      addFormRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            trigger: 'blur'
          }
        ]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {},
      // 修改的表单验证规则对象
      editFormRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            trigger: 'blur'
          }
        ]
      }
    }
  },
  methods: {
    // 获取所有商品列表数据
    getCateList: async function () {
      var { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取所有商品列表数据失败！')
      this.cateList = res.data
      console.log(this.cateList)
    },
    // 级联选择框选中项变化时触发
    handleChange: function () {
      this.getParamsData()
    },
    // tabs 切换时触发
    handleTabClick: function () {
      this.getParamsData()
    },
    // 获取参数列表数据
    getParamsData: async function () {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 证明选中的是三级分类
      var { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) return this.$message.error('获取参数列表失败！')
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClosed: function () {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮，添加参数
    addParams: function () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return ''
        var { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) return this.$message.error('添加参数失败！')
        this.setDialogVisible = false
        this.getParamsData()
        this.$message.success('添加参数成功！')
      })
    },
    // 点击按钮展开修改的对话框
    showEditDialog: async function (id) {
      var { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${id}`, { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) return this.$message.error('获取数据失败！')
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 重置修改的表单数据
    editDialogClosed: function () {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮修改参数信息
    editParams: function () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return ''
        var { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) return this.$message.error('修改失败！')
        this.getParamsData()
        this.editDialogVisible = false
        this.$message.success('修改成功！')
      })
    },
    // 点击删除按钮实现删除参数或属性
    deleteParams: function (id) {
      this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(async () => {
        var { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${id}`)
        if (res.meta.status !== 200) return this.$message.error('删除失败！')
        this.getParamsData()
        this.$message.success('删除成功!')
      }).catch(() => {
        this.$message.info('已取消删除!')
      })
    },
    // 抽取的保存row.attr_vals的网络请求事件
    saveAttrValues: async function (row) {
      var { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) return this.$message.error('修改失败！')
      this.$message.success('修改成功！')
    },
    // 文本框失去焦点或按下了回车键都会触发
    handleInputConfirm: async function (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return ''
      }
      // 如果输入合法则进行保存操作
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 发送网络请求保存到数据库中
      this.saveAttrValues(row)
    },
    // 点击展示文本框
    showInput: function (row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick:当页面上的元素被重新渲染之后在执行函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 监听Tag删除事件
    handleClose: function (i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrValues(row)
    }

  },
  computed: {
    // 如果需要按钮被禁用就返回true 否则返回false
    isBtndisabled: function () {
      if (this.selectedCateKeys.length !== 3) return true
      return false
    },
    // 当前选中的三级分类Id
    cateId: function () {
      if (this.selectedCateKeys.length === 3) return this.selectedCateKeys[2]
      return null
    },
    // 动态计算标题的文本
    titleText: function () {
      if (this.activeName === 'many') return '动态参数'
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
  .cat_opt {
    margin: 15px 0px;
  }

  .el-tag {
    margin: 10px;
  }

  .input-new-tag {
    width: 120px;
  }
</style>
